高炭素鋼の機械的性質

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タイトル別名
  • Mechanical properties of high carbon steels.
  • コウ タンソ コウ ノ キカイテキ セイシツ

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An investigation was conducted to find the effects of the thermomechanical processing developed by O.D. Sherby and his coworkers on the tensile and impact strengths of high carbon steels with Cr or Mn. Billets were warm-rolled at about 470K repeatedly to reduce their thickness from 70mm to 6mm. Tensile tests were performed at room temperature and Charpy impact tests were done between 194 to 473K. Observations of fracture patterns of the tensile and impact fractured surfaces were made by using scanning electron microscopy.<br>The results obtained are as follows:<br>(1) The processing gave fine spheroidal carbide particles and a ferrite matrix, and the sizes of grains and carbide particles increased with increasing carbon content.<br>(2) The tensile strength of 1.27% C steel with forged structure was slightly higher than that with rolled structure. A steel containing Mn had higher strength, and its elongation of 7% was improved up to 45% by solid solution treatment.<br>(3) The impact strength of forged steel was improved greatly by warm rolling. Although a steel containing Cr was not improved by water toughening, a steel containing Mn increased its impact value by water toughening.<br>(4) Fractographs of the tensile fractured surface of rolled steel showed fine dimples, seemingly associated with ductility. The distribution of voids in the area near ferrite structure was little denser than that near austenite structure.<br>(5) The impact fractured surface of a steel containing Mn exhibited smaller dimples than its tensile fractured surface.

収録刊行物

  • 材料

    材料 36 (404), 437-442, 1987

    公益社団法人 日本材料学会

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